CVE-2021-20835 json
Improper authorization in handler for custom URL scheme vulnerability in Android App 'Mercari (Merpay) - Marketplace and Mobile Payments Ap…
published 2021-11-24 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8247
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.6%
- EPSS 1.6% chance of exploitation in 30 days, percentile 76%
- public exploits
- 0
- none known
Summary
Improper authorization in handler for custom URL scheme vulnerability in Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) versions prior to 4.49.1 allows a remote attacker to lead a user to access an arbitrary website and the website launches an arbitrary Activity of the app via the vulnerable App, which may result in Mercari account's access token being obtained.
Patch / fix
- mercari mercari 4.49.1
Exploit prediction
1.63% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Affected products
- Mercari, Inc. Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version)
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
jvn.jp
/en/jp/JVN49465877/index.html
third-party-advisory
Sources
- CVE List CVE-2021-20835
- NVD CVE-2021-20835
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